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Cluster Installation: Difference between revisions
→Performance
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== Performance == | == Performance == | ||
Cluster nodes may have different numbers of processors. The algorithm that determines the number of threads used on a node is: | |||
Cluster nodes may have different numbers of processors. | |||
Please note that the output line | |||
number of OpenMP threads used NN | |||
in COLSPOT.LP and INTEGRATE.LP may be incorrect if MAXIMUM_NUMBER_OF_JOBS > 1, and the submitting node (the node that runs xds_par) has a different number of processors than the processing node(s) (the nodes that run mcolspot_par and mintegrate_par). The actual numbers of threads on the processing nodes may be obtained by | |||
grep PARALLEL COLSPOT.LP | |||
grep USING INTEGRATE.LP | uniq | |||
The algorithm that determines the number of threads used on a processing node is: | |||
NB = DELPHI / OSCILLATION_RANGE # this may be slightly adjusted by XDS if DATA_RANGE / NB is not integer | NB = DELPHI / OSCILLATION_RANGE # this may be slightly adjusted by XDS if DATA_RANGE / NB is not integer | ||
if MAXIMUM_NUMBER_OF_PROCESSORS is not specified in XDS.INP then MAXIMUM_NUMBER_OF_PROCESSORS = | NCORE = number of processors in the processing node, obtained by OMP_GET_NUM_PROCS() | ||
if MAXIMUM_NUMBER_OF_PROCESSORS is not specified in XDS.INP then MAXIMUM_NUMBER_OF_PROCESSORS = NCORE | |||
number_of_threads = MIN( NB, NCORE, MAXIMUM_NUMBER_OF_PROCESSORS, 99 ) | number_of_threads = MIN( NB, NCORE, MAXIMUM_NUMBER_OF_PROCESSORS, 99 ) | ||
This is implemented in BUILT=20191015 onwards. | This is implemented in BUILT=20191015 onwards. | ||